What does the term "Chordata" mean?
n. Any of numerous animals of the phylum Chordata, having at some stage of development a dorsal nerve cord, a notochord, and gill slits and including all vertebrates, the hagfishes, and certain marine animals such as the lancelets and the tunicates. [From New Latin Chordāta, phylum name, from Latin chorda, cord; see cord .]
What does "Chordata" mean in English?
Define chordate. chordate synonyms, chordate pronunciation, chordate translation, English dictionary definition of chordate. n. Any of numerous animals of the phylum Chordata, having at some stage of development a dorsal nerve cord, a notochord, and gill slits and including all...
What does the name Chordata mean?
What are the characteristics of the phylum echinodermata?
- These are exclusively marine animals.
- The larval forms show bilateral symmetry and adult forms show radial symmetry.
- They are triploblastic.
- It exhibits organ system grade of organisation.
- They have a true coelom.
- The body is uniquely shaped.
What are the 5 characteristics of chordates?
What are the 7 characteristics of a chordate?
- Notochord.
- Dorsal hollow nerve cord.
- Postanal tail.
- Segmented muscle bands.
- Endostyle.
- Brain.
- Pharyngeal gill slits.
What does Chordata mean?
Definition of chordate : any of a phylum (Chordata) of animals having at least at some stage of development a notochord, dorsally situated central nervous system, and gill slits and including the vertebrates, lancelets, and tunicates.
Where did chordates descend from?
Chordates are thought to have originated from a common ancestor (or ancestors) of the deuterostomes [7,12,17–20].
What makes a Chordata a Chordata?
Characteristics of Chordata. Animals in the phylum Chordata share five key chacteristics that appear at some stage during their development: a notochord, a dorsal hollow (tubular) nerve cord, pharyngeal gill arches or slits, a post-anal tail, and an endostyle/thyroid gland (Figure 2).
Who discovered Chordata?
Although the name Chordata is attributed to William Bateson (1885), it was already in prevalent use by 1880. Ernst Haeckel described a taxon comprising tunicates, cephalochordates, and vertebrates in 1866.
When did phylum Chordata first appear?
590 million years agoMany scientists maintain that chordates originated sometime earlier than 590 million years ago; that is, they predate the fossil record.
What is the common name for Chordata?
Scientific name: Chordata Chordates (Chordata) are a group of animals that includes vertebrates, tunicates, lancelets. Of these, the vertebrates—lampreys, mammals, birds, amphibians, reptiles, and fishes—are the most familiar and are the group to which humans belong.
How do you pronounce Chordata in English?
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Is a name of group of Chordata?
Chordata contains two clades of invertebrates: Urochordata (tunicates) and Cephalochordata (lancelets), together with the vertebrates in Vertebrata. Most tunicates live on the ocean floor and are suspension feeders. Lancelets are suspension feeders that feed on phytoplankton and other microorganisms.
Overview
A chordate is an animal of the phylum Chordata (/kɔːrˈdeɪtə/). All chordates possess five synapomorphies, or primary characteristics, at some point during their larval or adulthood stages that distinguish them from all other taxa. These five synapomorphies include a notochord, dorsal hollow nerve cord, endostyle or thyroid, pharyngeal slits, and a post-anal tail. The name “chordate” comes from the first of these synapomorphies, the notochord, which plays a significant role in c…
Anatomy
Chordates form a phylum of animals that are defined by having at some stage in their lives all of the following anatomical features:
• A notochord, a stiff rod of cartilage that extends along the inside of the body. Among the vertebrate sub-group of chordates the notochord develops into the spine, and in wholly aquatic species this helps the animal to swim by flexing its tail.
Classification
The following schema is from the 2015 edition of Vertebrate Palaeontology. The invertebrate chordate classes are from Fishes of the World. While it is structured so as to reflect evolutionary relationships (similar to a cladogram), it also retains the traditional ranks used in Linnaean taxonomy.
• Phylum Chordata
Subphyla
Cephalochordates, one of the three subdivisions of chordates, are small, "vaguely fish-shaped" animals that lack brains, clearly defined heads and specialized sense organs. These burrowing filter-feeders compose the earliest-branching chordate sub-phylum.
Most tunicates appear as adults in two major forms, known as "sea squirts" and salps, both of which are soft-bodied filter-feeders that lack the standard features of chordates. Sea squirts are …
Phylogeny
There is still much ongoing differential (DNA sequence based) comparison research that is trying to separate out the simplest forms of chordates. As some lineages of the 90% of species that lack a backbone or notochord might have lost these structures over time, this complicates the classification of chordates. Some chordate lineages may only be found by DNA analysis, when there is no physical trace of any chordate-like structures.
Closest nonchordate relatives
Hemichordates ("half chordates") have some features similar to those of chordates: branchial openings that open into the pharynx and look rather like gill slits; stomochords, similar in composition to notochords, but running in a circle round the "collar", which is ahead of the mouth; and a dorsal nerve cord—but also a smaller ventral nerve cord.
There are two living groups of hemichordates. The solitary enteropneusts, commonly known as "…
History of name
Although the name Chordata is attributed to William Bateson (1885), it was already in prevalent use by 1880. Ernst Haeckel described a taxon comprising tunicates, cephalochordates, and vertebrates in 1866. Though he used the German vernacular form, it is allowed under the ICZN code because of its subsequent latinization.
See also
• Chordate genomics
• List of chordate orders – All the classes and orders of phylum Chordata